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June 7, 2011
Astronaut Dafydd R. (Dave) Williams, STS-90 mission specialist, simulates a contingency space walk in the Neutral Buoyancy Laboratory of the Johnson Space Center's Sonny Carter Training Center. Williams, making his first flight in space in April aboard the Space Shuttle Columbia, represents the Canadian Space Agency (CSA). There are no scheduled extravehicular activity (EVA) duties scheduled for the Neurolab mission. However, each crew has assigned members trained for contingencies requiring work in the environment outside the shirt sleeve conditions of the crew cabin. Since the European Space Agency's (ESA) Spacelab science module is in the cargo bay, fully suited crew members would have to egresss the Space Shuttle Columbia through the tunnel connecting the module to the orbiter.

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